Maytag MDG78 Operator's Manual

Part No. 113065MDG-75Installation/Operator's ManualFor replacement parts, contact the distributor from which the dryerwas purchased orMAYTAG403 W

6SECTION IISPECIFICATIONS/COMPONENT IDENTIFICATIONA. SPECIFICATIONS * For non-reversing models. ** A minimum of 3/4" pipe must be supplie

7SpecificationsMDG-75(Hot Surface Ignition)NOTE: Manufacturer reserves the right to make changes in specifications at any time, without notice oroblig

8B. COMPONENT IDENTIFICATION1. Dryer Front ViewIllus. No. Description1 Controls2 Control (top access) Door Assembly3 Main Door Assembly4 Lint Compart

92. Dryer Rear ViewIllus. No. Description1 Heating Unit2* Electric Service Relay Box3 Tumbler Bearing Mount Assembly4 Idler Bearing Mount Assembly5 Bl

10SECTION IIIINSTALLATION PROCEDURESInstallation should be performed by competent technicians in accordance with local and state codes. In theabsenc

11B. UNPACKING/SETTING UPRemove protective shipping material (i.e., plastic wrap, or optional shipping box) from dryer.IMPORTANT: Dryer must be trans

12C. DRYER ENCLOSURE REQUIREMENTSBulkheads and partitions should be made of noncombustible materials and must be located a minimum of12-inches (18-in

13D. FRESH AIR SUPPLYWhen the dryer is operating, it draws in room air, heats it, passes this air through the basket (tumbler), andexhausts it out of

14E. EXHAUST REQUIREMENTS1. General Exhaust Duct Work InformationExhaust duct work should be designed and installed by a qualified professional. Im

15NOTE: Where the exhaust duct work passes through a wall, ceiling, or roof made of combustiblematerials, the opening must be 2-inches larger (all the

Retain This Manual In A Safe Place For Future ReferenceFor replacement parts, contact the distributor from which the dryer was purchased or contact:MA

16IMPORTANT: For extended duct work runs, the cross section area of the duct work can only beincreased to an extent. When the duct work approaches th

17

18F. ELECTRICAL INFORMATION1. Electrical RequirementsIt is your responsibility to have ALL electrical connections made by a properly licensed and comp

192. Electrical Service Specificationsa. Gas ONLYIMPORTANT: Figures shown are for Non-Reversing Models ONLY. For reversing modelscontact the factory.

203. GroundingA ground (earth) connection must be provided and installed in accordance with state and local codes. In theabsence of these codes, grou

21Actual electrical wire connections are made to the L1 and L2 terminals of the motor contactor locatedin the rear service box mentioned above. The g

22The only electrical input connections to the dryer are the 3-phase (3ø) power leads (L1, L2, L3, andsometimes neutral) and ground. Single-phase (1ø

233) 3-Phase (3ø) Wiring Connections or Hookup (for Reversing Models Only)The electrical connections on ALL 3-phase (3ø) gas dryers dryers are made i

24G. GAS INFORMATIONIt is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the gasplumbing instal

252. Technical Gas Dataa. Gas Specificationsb.Gas Connections: Inlet connection ------------ 3/4-inch N.P.T. Inlet supply size ------------ 3/4-

IMPORTANTYOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GASSUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THEMACHINE TO ALLOW ACCESS

263. Piping/ConnectionsALL components/materials must conform to National Gas Code specifications. It is important that gaspressure regulators meet ap

27Consistent gas pressure is essential at ALL gas connections. It is recommended that a 3/4-inch pipe gas loopbe installed in the supply line serving

28H. PREPARATION FOR OPERATION/START-UPThe following items should be checked before attempting to operate the dryer:1. Read ALL "CAUTION,"

29I. PREOPERATIONAL TESTSALL dryers are thoroughly tested and inspected before leaving the factory. However, a preoperational testshould be performed

303.Make a complete operational check of ALL safety related circuits:a. Door Switch(es)b. Hi-Limit thermostatsc. Sail switch - Gas ModelsNOTE: To chec

317. Reversing Models ONLYBasket (tumbler) dryer should never be operated with less than a 30 lb. load (dry weight). The size of theload will affect t

32K. SHUT DOWN INSTRUCTIONSIf the dryer is to be shut down (taken out of service) for a period of time, the following must be performed:1. Discontinue

33SECTION IVSERVICE/PARTS INFORMATIONA. SERVICE1. Service must be performed by a qualified trained technician, service agency, or gas supplier. If

34SECTION VWARRANTY INFORMATIONA. RETURNING WARRANTY CARD(S)1. Before any dryer leaves the factory test area, a warranty card (Part No. 112252) is p

35SECTION VIROUTINE MAINTENANCEA. CLEANINGA program or schedule should be established for periodic inspection, cleaning, and removal of lint from va

WARNINGThe dryer must never be operated with any of the back guards, outer tops, or servicepanels removed. PERSONAL INJURY or FIRE COULD RESULT.IMPOR

3690 DAYS1. Remove lint from around basket (tumbler), drive motors, and surrounding areas.2. Remove lint from gas valve burner area with a dusting bru

37B. ADJUSTMENTS7 DAYS AFTER INSTALLATION and EVERY 6 MONTHS THEREAFTERInspect bolts, nuts, screws, (bearing set screws), non-permanent gas connectio

38SECTION VIIPROCEDURE FOR FUNCTIONAL CHECK OFREPLACEMENT COMPONENTS1. Microprocessor (computer) Boarda. Upon completing installation of the replacem

39d. Verify that the motors heat, and door indicator lights on the back side of the microprocessor (computer)board are lit. (Refer to the illustratio

40d. The hot surface ignitor will turn on. After approximately 4 seconds the Glo Bar will shut off and the gasvalve will be energized. The flame shoul

41SECTION VIIIREVERSING TIMER SPIN AND DWELLADJUSTMENTSDual timer models with "reversing option" have an electric reversing timer in the el

42When contacting MAYTAG certain information is required to insure proper service and parts information fromthe manufacturer. This information is on

43THE DATA LABEL1. MODEL DRYERThe model number is a number which describes the size of the dryer and thetype of heat (gas or electric).2. SERIAL NUMBE

44SECTION XTROUBLESHOOTINGWARNING: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY andTHE GAS SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVEDFROM

450,&52352&(6625&20387(502'(/6&217,18(', 30 & : 1 $ $ .  ( 

Table of ContentsSECTION IIMPORTANT INFORMATION ... 3A. Receiving and Ha

46MICROPROCESSOR (COMPUTER) MODELSA. No L.E.D. (light emitting diode) display (for microprocessor [computer] models ONLY)...1. Service panel fuse blow

47E. Blower and Fan motor is not operating (does not start)...1. Microprocesssor controller (computer) motor indicator dot and relay output L.E.D. (li

48b. Loose connection in main door switch circuit.J. Microprocessor (computer) L.E.D. (light emitting diode) display reads "dSFL" continuous

49O. Microprocessor controller (computer) locks up and L.E.D. (light emitting diode) display readserroneous message(s) or only partial segments...1. T

50T. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model - HSI module,Electric Model - electric oven contactor when

51U. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model) when dryer is first started and both the heat indicator d

52W. Dryer operates but is taking too long to dry...1. Exhaust duct work run is too long or is undersized...back pressure cannot exceed 0.3 inches wat

53X. At the completion of the "AUTO" drying/cooling cycle, the load is coming out over dried...1. Percent of dryness (dryness level) of the

54Z. Main burners are burning with a yellow flame (for Gas Models ONLY)...1. Poor air and gas mixture (too much gas or not enough air) at the burner .

557. V-belts too tight or too loose.8. Tumbler bearing set screws are loose.9. Failed motor bearing.TIMER MODELSA. Dryer will not start...both drive m

SECTION VIROUTINE MAINTENANCE ... 35A. Cleaning ...

56D. Drive motor operates okay for a few minutes, then stops and will not restart...1. Motor is overheating and tripping out on internal overload pro

57b. Sail switch damper is not closing or is fluttering.1) Lint screen is dirty.2) Restriction in the exhaust.3) No exhaust air flow ...a) Failed im

J. Dryer operates but is taking too long to dry...1. Exhaust duct work run is too long or is undersized... back pressure cannot exceed 0.3 inches wate

3) Sail switch is fluttering ...a) Lint screen is dirty or is not being cleaned often enough.b) Restriction in the exhaust.4) Failed burner hi-limit..

K. Main burners are burning with a yellow flame (for Gas Models ONLY)...1. Poor air and gas mixture (too much gas or not enough air) at the burner ...

3. Loose basket (tumbler) tie rod.4. Basket (tumbler) out of adjustment, or adjustment bolts (hardware) are loose.5. Failed basket (tumbler) support.6

Part No. 113065 1-11/30/98-75 2*01/07/998-50

3SECTION IIMPORTANT INFORMATIONA. RECEIVING and HANDLINGThe dryer is shipped in a protective stretch wrap cover with protective cardboard corners an

4B. SAFETY PRECAUTIONSWARNING: For your safety, the information in this manual must be followed to minimize therisk of fire or explosion or to preven

57. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaustduct work, and inside the dryer. The fre